Of these, the dull spellbook may cause the player to fall asleep when reading it. This currently ignores sleep resistance, which is bug C360-15 in NetHack 3.6.0.

The source code also contains appearances for the deferred spellbooks of flame sphere and freeze sphere, which are canvas and hardcover respectively. These will presumably be randomized if the spellbooks are enabled.

Rings

Rings (other than the meat ring) will randomly take one of the following appearances:

Of these, topaz, sapphire, ruby, steel, diamond and emerald rings can be used to semi-permanently engrave something on the floor.

If you are wearing a silver ring and are not wearing gloves[1], you will do extra damage to silver-hating monsters with bare-handed and martial arts attacks.

The appearance of rings determines what monsters can eat them, and also influences golem creation when polypiling. The former is especially important because you can sometimes gain intrinsics from eating rings while you are polymorphed. Pearl, iron, twisted, steel, wire, engagement, and shiny can be eaten by any metallivore (rock mole, xorn, or rust monster). Bronze, brass, copper, silver, and gold can be eaten by any metallivore not restricted to rustable metals (rock mole and xorn). Additionally, gelatinous cubes can eat wooden rings.

Glass and crystal wands are fragile so they can break. This is significant if you kick the chest that stores the wand of wishing in the castle. The appearance of wands also determines what monsters can eat them, and also influences golem creation when polypiling. Eating a wand while polymorphed however has no effect besides nutrition.

Armor

The material of armor is determined by its type, not by its appearance. This is significant for gloves and boots: gauntlets of power and kicking boots are iron, the rest are leather. Some appearances have additional effects.

Boots

Of these, snow boots and riding boots are special. The former prevents the fumbling effect of ice and the latter increases the chance of successfully saddling a steed. However, this bonus is not cumulative with the riding gloves.

SLASH'EM

Due to the many new items in SLASH'EM, new randomized appearances were added.
See that article for more information.

The cloak that happens to have the randomized appearance "opera cloak" will appear much more often than its base type's frequency suggests, because many vampires will be generated with one. At least in the case of cloaks of invisibility and magic resistance, it also means many vampires will be invisible or magic resistant.

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